Today's Message Index:
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1. 07:13 AM - Re: Looking for Countersink for 4-40 Screws that allows "tapping" for screw threads (John Danielson)
2. 01:46 PM - Re: Looking for Countersink for 4-40 Screws that allows "tapping" for screw threads (Warren Brecheisen)
3. 03:20 PM - Re: Looking for Countersink for 4-40 Screws that allows "tapping" f... (Hopperdhh@aol.com)
4. 03:49 PM - Re: Looking for Countersink for 4-40 Screws that allows "tapping" f... (Hopperdhh@aol.com)
Message 1
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Subject: | Re: Looking for Countersink for 4-40 Screws that allows "tapping" |
for screw threads
Where are these #4's being used?
Sent from Samsung Mobile
Garey Wittich <gareywittich2000@yahoo.com> wrote:
I posed the original question. The 4-40 screws I will be using (MS24693 fo
rmerly AN507) have the 100 Degree angle just like the the AN426AD rivets.
The Countersink I am looking for needs to have a 100 degree angle and have
a 0.089" Diameter Guide Pin so the 0.089 Dia hole in the material can be "
Tapped" for the 4-40 screw threads after countersinking. Using a 100 Degre
e Deburring Tool Bit will be too time consuming because of the number of sc
rews used. Using #6 Screws or larger will be a problem. Using the Counte
rsink made by Cleveland for 4-40 screws has too big a diameter Guide Pin.
Any ideas where to get the above Countersink (100 Degree Angle and 0.089"
Dia Guide Pin) ?? Many thanks, Garey Wittich
rsbooks.com>
m>
Message 2
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Subject: | Looking for Countersink for 4-40 Screws that allows "tapping" |
for screw threads
The only 100 degree countersinks I've run across that are even close to .089
are for #40 drill bit holes.
Warren
Message 3
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Subject: | Re: Looking for Countersink for 4-40 Screws that allows "tapping" |
f...
Why not drill the holes first with #40 then countersink and then enlarge to
.089?
Dan Hopper
RV-7A
Flying since 2004
In a message dated 12/31/2012 4:46:47 P.M. Eastern Standard Time,
n146wb@cfu.net writes:
The only 100 degree countersinks I=99ve run across that are even clo
se to
.089 are for #40 drill bit holes.
Warren
(http://www.aeroelectric.com/)
(http://www.buildersbooks.com/)
(http://www.homebuilthelp.com/)
(http://www.matronics.com/contribution)
(http://www.matronics.com/Navigator?RV-List)
Message 4
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Subject: | Re: Looking for Countersink for 4-40 Screws that allows "tapping" |
f...
I know this has come up before, but my #40 countersink is undercut enough
that it could be turned down to .089 and still cut at the root. That's
only .009 to go from .098 to .089. That's only .0045 off the surface.
Dan
In a message dated 12/31/2012 4:46:47 P.M. Eastern Standard Time,
n146wb@cfu.net writes:
The only 100 degree countersinks I=99ve run across that are even clo
se to
.089 are for #40 drill bit holes.
Warren
(http://www.aeroelectric.com/)
(http://www.buildersbooks.com/)
(http://www.homebuilthelp.com/)
(http://www.matronics.com/contribution)
(http://www.matronics.com/Navigator?RV-List)
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